Apparatus for producing hollow aluminum boot-trees by tip casting



E. KISTINGER *May 7, 1935.

APPARATUS FOR PRODUCING HOLLOW ALUMINIUM BOOT TREES BY TIP CASTING Filed Sept. 15, 1952 Patented May 7, 1935 I U ITE STATES PATENT OFFICE APPARATUS FOR PRODUCING nouow ngmom BOOT-TREES B! m cas'r- Emil Kistinger, Trier-'on the-Mosel, Germany Application September 15, 1932, Serial No. 633,292 y y In Germany September 16, 193i 11 Claims. (01.22-15) The production of hollow :boot-trees made attention of the caster, the invention may be in:- especially of aluminum by means of tip casting the: developed by bringing an obstaclein the path is carried out in a longitudinal divided mold by to he travelled by the'mold because as is known, employing inflow and outflow funnels which are the mold itself must perform an oscillating movesituated diametrically opposite, one at the heel ment, which obstacle releases a control auto- 3 portion and the other at the toe portion, so that maticaily actuating the pin for keeping open the the method may be called a through-pouring aperture. method. This method is open to considerable ob- The two embodiments of the invention are ii.- jections. The mold becomes overheated at the lustrated by wayoi example in'the accompanying 0 inflow point where the whole of the molten metal drawing, in

must flow past at a high temperature. The re Fig. 1 shows one hall of a'mold with a push mote outflow point remains cooler andis more- D in e toe porti for e p p the over flushed by metal which has already cooled. dmi sion. p Consequently, at this point, approximately in th Fig. 2 shows one half of a mold with a pin in toe-portion, the metal deposits in thicker layers the t e p o for keeping p the ad o 15 than near the inflow point, so that the wall of the and in longitudinal section a vmechanical device work is of irregular thickness. It must also be for c t ll t m v nt 0f e, P nborne in mind that the molten metal flows away F is a longitudinal section thro mmore rapidly from the lightly heated heel portion e i for the D1 in anelihel fi 9 of the mold during the through-pouring and retion to that illustrated in Fig. 2. a m

mains longest in the cooler portion. The finished 4 is 1501) P n V Partly i ion product possesses likewise certain defects. The On a larger Sca e, showing the controlling d vic funnels, necessary for guiding the molten metal for the pin in a position shortly before bein S into and out of the mold, leave large holes after in Operation.

a they have been severed, the hole on the toe por- 5 is a P P V Of the c t ll tion having to be closed by welding. Apart from Vice 0f the P Beeerdihg t0 8- the P b in the "work and expens whi h thi t il shown turned at the instant of its release for the that the weld must be carefully removed, black upward mevemenlispots remain on the tree owing to the decompo I the drawing ne ha o a mold'a is shown sition of the particles of welding powder still enwith a Single funnel b Situated near the h l P 30 closed in the weld seam, which spots are translien and adapted to be tipped around 8 Div ierred to andsoil the lining of the shoes which is D 11 into the Position own in do ted linesoften of light colour. At the toe point the mold has an aperture e about It has already been proposed to employ l gpthree to four mms. in width, serving for ventilatudinally divided molds with only one funnel serv tion- In this pe u a easily ovable pin a 35 ing for the inflow and outflow of the molten metal. is inserted so far that when the metal s P e However, in this proposal the fact has not been in the P p c h h h Wall of the castinx. considered that, during the outflow, a vacuum in course of formfltien and th a ter the 1111 8 must occur in the mold which results in the 0f h mold a turning 11 p and w m v danger of the external pressure pressing in th ment is communicated'to t pin. when a wall 40 wall of the work which has just been formed and of suflicient thickness has formed in the mold. th

is therefore still delicate. The invention has for P I! is Pulled out and the mold pp P its object, to overcome this objection and consists t h excess of l n m talin the introduction of a ventilation, even if only AS a rule the Small ll e 6 can remain on slight, at the highest point of the mold from which the fi e tree, 50 that the Welding Otherwise the molten metal first flows oil. It is true that in usual is not necessary, a Small metal P 8 0811 this instance it must be reckoned with, that the be driven therein the aperture lo y narrow air admission aperture could become m sclogged with metal; Consequently a further For ensuring the au m m v of the P feature of the invention consists in that an elepin an abutment i of a frame part is arranged in 50 ment for keeping tree the passage is inserted in the path-of the mold as shown in Figs. 2 to 5, in the aperture and subjected to a continual dissuch a manner that the projecting portion or the placement during the casting operation. A push pin strikes against this abutment and is displaced pin is the simplest implement, for this purpose. in the mold. In a cyiind'rlcal casmgm arranged 66 If it is desired to be independent of the care and on the toe point the pin a with a collar n is.

guided under the action of a pressure spring 1,

this collar being held in lowered position in an annular groove in the interior of the casing by a kind of bayonet joint, thereby compressing the spring ,1. The collar 11. has a nose 1' which can engage in a longitudinal groove p in the casing.

If during the oscillation of the mold in the direction of the single barbed arrow, the transverse arm g of the pin g comes into contabt with the abutment i, the pin first carries out a partial rotation in the direction of the double barbed arrow (Figs. 4, 5) causing the nose r, which was hitherto held in the annular groove 0, to enter the longitudinal groove p, so that the pin 9 o can be shifted and pressed outwards by the spring 7, thereby freeing the air passage (Fig. 3).

1. Apparatus for producing hollow boot-trees, especially of aluminum, by means of tip casting comprising, in combination, a longitudinally divided mold having a ventilation hole at the extreme toe portion of the mold, means whereby the mold may be tilted to a position such that the extreme toe portion is at the highest point of the ing ed the excess molten metal, a removable insert body in said ventilation hole; means in the path of tilting movement of the mold for rotating the insert body, and means for thereupon moving the insert body longitudinally.

2. Apparatus for producing hollow boot-trees, especially of aluminum, by means of tip casting comprising, in combination, a longitudinallydivided mold having a single funnel which serves as inlet and outlet for the metal, a ventilation hole at the extreme toe'portion of said mold, an insert body shiftable' with play in said ventilation hole and in its inner position protruding within the cavity of the'mold so far as to penetrate the wall of the boot-tree to be produced, means whereby the mold may be tilted to aposition such that said extreme toe portion is at the highest point of the mold, whereby bubbling of the molten metal in the mold will be eliminated, and means for engaging and imparting a separate movement to said insert body, the funnel being positioned on the mold so that its weight will cause the mold to assume a position such that the ventilation hole is disposed at the highest point of the mold cavity when the mold is tipped and serves as an air outlet during the filling opera-.

tion.

3. Apparatus for producing hollow boot-trees, especially of aluminum, by means of tip casting comprising, in combination, a'longitudinally divided mold having a single funnel which serves as inlet and outlet'for. the metal, a ventilation hole at the extreme toe portion of said mold, an

- mold is tilted, means for holding the insert body loosely in said ventilation hole prior to its release, and means for imparting a withdrawal movement to the insert, body when the insert bodyis released. r

4. Apparatus for producing hollow boot-trees especially of aluminum by means of tip casting comprising, in combination, a longitudinally divided mold having a ventilation hole at the exthan, the thickness of the wall of the solidified boot-tree, whereby, upon removal of the body from the ventilation hole when the mold is tipped to cause the excess molten metal to become poured out after the molten metal adjacent to the walls of the mold have become solidified to a substantial thickness, air will enter freely through the ventilation hole into the interior of the solidified boot-tree through the ventilation hole and through the wall of the boot-tree at its highest point.

5. Apparatus of the character described comprising a mold having a ventilation hole, an insert body in the hole, means whereby the mold may be tilted to a position such that the ventilation hole is at the highest point of the mold, whereby bubbling of the molten metal in the mold will be eliminated, means for releasing the insert body when the mold is tilted, means for holding the insert body loosely in said ventilation hole prior to-its release, and means for imparting a withdrawal movement to the insert body when the insert body is released.

6. Apparatus of the character described comprising a mold having a ventilation hole, an insert body in the hole, and provided with an external projection, an abutment, and meansin the path of tilting movement of the mold for causing the projection tokengage the abutment to actuate the body.

'7. Apparatus of the character described comprising a mold having a ventilation hole, a cylindrical casing, a pin slidably mounted in the easing and the hole, means yieldingly tending to actuate the pin slidably in the casing and the hole, means for maintaining the pin against slid-. able movement, and means in the path of tilting movement oi'the mold and means for rendering the maintaining means ineffective and to permit the yielding tending means to eflect the slid-- able movement 0! the pin.

8. Apparatus for producing hollow boot-trees especially of aluminum by means of tip casting comprising, in combination, a longitudinally divided mold having a ventilation hole, two pivot pins at the outer side or the mold parts, arranged opposite oneanother, the mold being adapted to oscillate round the common axis of said pivot 'pins, said mold having a funnel serving for filling the mold with molten metal and for pouring 05 the excess molten metal, said pivot pins, said ventilation hole and said funnel being arranged in such a position to one another that the ventilation hole is at substantially the highest point of the mold cavity during the filling operation as well as during the tilting movement for pouring off the excess molten metal, and a removable insert body shirtable with play in said ventilation hole and extending into. the cavity of the mold a distance equal to or slightly greater then, but not substantially greater or less than the thickness of the wall of the solidified boot-tree, whereby, upon removal of the body from, the ventilation-hole 1Q wnen the mold is tipped to cause the excess body has become rotated by means of said abutmolten metal to become poured out after the ment.

molten metal adjacent to the walls of the mold 11. Apparatusof the character described comhas become solidified toa substantial thickness, prising ah oscillatable mold having a ventilation air will enter freely through the ventilation hole hole, a cylindrical casing, a pin slidably mounted and through the hole in the wall of the boot-tree in said casing and the hole, means yieldingly into the interior of the latter at its highest point. tending to actuate the pin slidably in the-casing 9. Apparatus as claimed in claim 8 in which and in the hole, means for maintaining the pin the insert body comprises a pin, and means for against'slidabie movement, said pin having an ex- .shiiting said pin inalcngitudinal direction. ternal projection, and an abutment adapted to 10 .0. Apparatus of the character described comengage said projection whenthe mold'is tilted, prising an oscillatable mold havinga ventilathereby causing said pin to rotate axially, this tion hole, an insert body. in said hole and 'proaxial rotation of the pin rendering the maintainvided with an external projection, an abutment ing means inefiective and permitting the yielding adapted to engage said projection when the mold tending means to efiect the slidable movement 5 is tilted, thereby causing said insert body to roof the pin.

tate axially, and means for shifting said insert EliHLKISTINGER. body in a longitudinal direction when the insert 

